Kotlin puzzler

interesting kotlin language quiz.

Transcript

1. Kotlin Puzzler to help your “Huh?” situations PARK MIREUK
2. This session is 7 puzzles 01 1min ~ 1.5min
 to solve 02 interpretation 03 https://goo.gl/ejrMtw
3. Purpose -Not a test -Save your debugging time -To understand kotlin language -For fun (remember easily) Before.. https://goo.gl/ejrMtw
4. My BankAccount 01
5. result: 1. a and b is equal:true 2. a and b is equal:false https://goo.gl/ejrMtw
6. result: 1. a and b is equal:true 2. a and b is equal:false https://goo.gl/ejrMtw
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9. The compiler automatically derives the following members from all properties declared in the primary constructor: - equals(), hashCode(), toString(), componentN(), copy() https://goo.gl/ejrMtw
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12. Engineer’s lover 02
13. result: 1. There is no lover. 2. Soo:null 3. nothing https://goo.gl/ejrMtw
14. result: 1. There is no lover. 2. Soo:null 3. nothing https://goo.gl/ejrMtw
15. “I don’t know…maybe ?.let doing something..” Why?? https://goo.gl/ejrMtw
16. Let’s talk about ?.let Use ‘?.let’ for null check? • Yes, you can. https://goo.gl/ejrMtw
17. Let’s talk about ?.let Use ‘?.let’ for null check? • Yes, you can. • But, checking null works with safe call ?. 
 not related with let https://goo.gl/ejrMtw
18. Let’s talk about ?.let let, run, also, apply . • Expression • Scope https://goo.gl/ejrMtw
19. Let’s talk about ?.let let, run, also, apply . • Expression • Opposite of Statement • Has returns • Scope https://goo.gl/ejrMtw
20. Let’s talk about ?.let let, run, also, apply . • Expression • Opposite of Statement • Has returns • Scope https://goo.gl/ejrMtw
21. result: 1. There is no lover. 2. Soo:null 3. nothing https://goo.gl/ejrMtw
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24. If the expression to the left of ?: is not null, the elvis operator returns it, otherwise it returns the expression to the right. Execute expression to the left of ?: is null, Not ‘james.lover’ is null https://goo.gl/ejrMtw
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26. Execute expression to the left of ?: is null https://goo.gl/ejrMtw
27. Easy Book 03
28. result: 1. hasAuthorName:true 2. hasAuthorName:false https://goo.gl/ejrMtw
29. result: 1. hasAuthorName:true 2. hasAuthorName:false https://goo.gl/ejrMtw
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32. Need to check operator != first. Left expression of != and right expression of !=. https://goo.gl/ejrMtw
33. No account, No password 04
34. result: account is 1. empty. 2. . 3. null. password is 1. empty. 2. . 3. null. https://goo.gl/ejrMtw
35. result: account is 1. empty. 2. . 3. null. password is 1. empty. 2. . 3. null. https://goo.gl/ejrMtw
36. result: account is 1. empty. 2. . 3. null. password is 1. empty. 2. . 3. null. https://goo.gl/ejrMtw
37. result: account is 1. empty. 2. . 3. null. password is 1. empty. 2. . 3. null. https://goo.gl/ejrMtw
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41. null “null” https://goo.gl/ejrMtw
42. result: account is 1. empty. 2. . 3. null. password is 1. empty. 2. . 3. null. https://goo.gl/ejrMtw
43. My name is 05
44. result: 1. Hello, my name is james 2. Hello, my name is 3. nothing https://goo.gl/ejrMtw
45. result: 1. Hello, my name is james 2. Hello, my name is 3. nothing https://goo.gl/ejrMtw
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48. Compile error https://goo.gl/ejrMtw
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51. Memo 06
52. result: 1. pass 2. fail https://goo.gl/ejrMtw
53. result: 1. pass 2. fail https://goo.gl/ejrMtw
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56. junit assert kotlin assert$ https://goo.gl/ejrMtw
57. % “write failing test first” remember https://goo.gl/ejrMtw
58. Be our guest 07
59. result: https://goo.gl/ejrMtw
60. result: 1:6, 2:6 
 3:6, 4:7, 5:7 6:6, 7:8, 9:7 https://goo.gl/ejrMtw
61. https://goo.gl/ejrMtw
62. 1. Same as java final https://goo.gl/ejrMtw
63. https://goo.gl/ejrMtw
64. 2. Hire at least two.. https://goo.gl/ejrMtw
65. Thank You
66. Thank You